David Letterman’s 33-year run on late-night television was marked by his acerbic sense of humor.
Upon retiring in 2015, he’s undergone a metamorphosis into someone almost unrecognizable from the more comedic guy people watched on the “Late Show with David Letterman”.
He’s grown a full beard, which coupled with his balding head, makes him look like a guy wanting to moonlight as a department store Santa Claus.
But beneath that kindly-looking exterior lurks a clearly bitter and troubled man, as evidenced by recent nasty remarks about President Donald Trump.
It’s spelled out on the next page. See how the funny guy seems to have lost his sense of humor.

Senile moment …he forgot which president he was talking about.
but your smart not
No David you are ignorant and a has been. No one wants to hear anything you have to say!
What you know you freaking retard Bill Oreilly use to punk you out.
David, have you lost your mind? Certainly sounds as if you have. . .
If Trump is ignorant and is a Billionaire what does this make Letterman…A Fool?
Go into that goodnight
Mr letterman
Ur not funny anymore
Didn’t listen to him when he was on TV don’t care to listen to him, now
Letterman was more often offensive & jaded, than amusing.